THRIFT-4675: Generate Int64 constants for js
diff --git a/lib/js/README.md b/lib/js/README.md
index 9d51e2a..5c7a1c2 100644
--- a/lib/js/README.md
+++ b/lib/js/README.md
@@ -138,3 +138,8 @@
 
     thrift --gen js:ts file.thrift
 
+# Breaking Changes
+
+## 0.13.0
+
+1. 64-bit integer constants are now generatd using node-int64 e.g.: var x = new Int64("7fffffffffffffff");